Merge 5.14-rc5 into char-misc-next

We need the fixes in here as well, and resolves some merge issues with
the mhi codebase.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 4aee3db6d6df..fa68e9817929 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -505,7 +505,9 @@ static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
 				      struct spi_message *msg)
 {
 	struct spi_device *spi = msg->spi;
+	struct spi_transfer *xfer;
 	u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
+	u32 min_speed_hz = ~0U;
 	u32 testreg, delay;
 	u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
 
@@ -577,9 +579,21 @@ static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
 	 * be asserted before the SCLK polarity changes, which would disrupt
 	 * the SPI communication as the device on the other end would consider
 	 * the change of SCLK polarity as a clock tick already.
+	 *
+	 * Because spi_imx->spi_bus_clk is only set in bitbang prepare_message
+	 * callback, iterate over all the transfers in spi_message, find the
+	 * one with lowest bus frequency, and use that bus frequency for the
+	 * delay calculation. In case all transfers have speed_hz == 0, then
+	 * min_speed_hz is ~0 and the resulting delay is zero.
 	 */
-	delay = (2 * 1000000) / spi_imx->spi_bus_clk;
-	if (likely(delay < 10))	/* SCLK is faster than 100 kHz */
+	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
+		if (!xfer->speed_hz)
+			continue;
+		min_speed_hz = min(xfer->speed_hz, min_speed_hz);
+	}
+
+	delay = (2 * 1000000) / min_speed_hz;
+	if (likely(delay < 10))	/* SCLK is faster than 200 kHz */
 		udelay(delay);
 	else			/* SCLK is _very_ slow */
 		usleep_range(delay, delay + 10);